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Preferred term

ultra and enigma  

Definition

  • In the early 1920s a German manufacturer advertised an enciphering machine that it declared unbreakable. The machine, called the Enigma, used a series of rotors and electrical plugs to encipher a message before transmission. [Source: Encyclopedia of War & American Society; Ultra and Enigma]

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https://concepts.sagepub.com/social-science/concept/ultra_and_enigma

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